Questions tagged [cabin-pressure]

Airplane cabins are pressurized so that the air inside remains breathable at high altitudes.

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4
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1answer
158 views

How does a DC-10 flight engineer manually raise the cabin altitude?

Reading into Federal Express Flight 1406 and I noticed when the flight engineer said he was raising the cabin altitude “manually” I assume this has something to do with cutting off the oxygen, but how ...
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1answer
646 views

Can the RAM AIR valve cause depressurization on the CRJ-900?

On the CRJ-900 AIR-CONDITIONING panel there is a RAM AIR switch light which opens a valve and allows air from the ram air scoop to enter the mixing manifold for distribution to both the flight deck ...
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What is the Function of Pressurization Light on Exit Doors for Commercial Airliners?

I am well aware that the average human is unable to open plug doors in flight due to pressurization of the cabin. I've noticed, however, a "cabin pressure" warning light in the window of exit doors, ...
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1answer
141 views

What is the physical experience of passengers in the cabin during an Emergency Descent?

I am not a pilot so please forgive any misuse of aviation terminology; I'm merely a person who is working hard to overcome a sudden and intense fear of flying. While working through a course to ...
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If you depressurize an aircraft at FL340, will the temperature inside fall to match the temperature outside?

Assuming you’d have an oxygen mask on before hand, and you depressurized the aircraft at FL340, would the inside and outside temperatures quickly become the same?
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2answers
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Can you get sucked out of a hole in an aircraft?

I had always been under the impression that the forces of air rushing out a broken window or hole in an airplane would be pretty limited and nothing near the levels necessary to carry a body through ...
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3answers
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Is the F-16 cockpit pressurized?

Is the F-16's cockpit pressurized? If so, why does the pilot receive oxygen from the mask (please state the correct terminology for this)? Is it due to redundancy in case cabin pressurization fails?
9
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1answer
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How does the cabin pressure controller work in a large commercial airliner?

The cabin pressure controller controls the pressure in the cabin in relation with aircraft altitude, and a manual control is possible using the overhead panel: A320 Air Conditioning and Cabin ...
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5answers
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How thick is the skin of an aircraft like the Airbus A350 or Boeing B777?

We can evaluate how thick walls are by looking at door or window frames, however that isn't representative of an aircraft fuselage, which appears to be very thin: Airbus A350 XWB forward fuselage, ...
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1answer
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What is pressurization influence (if any) on maximum G load an airliner can withstand?

Reading here about skin thickness of airliners I was wondering if, considering some pressurized airliner at cruise altitude, there are differences in maximum operational acceleration loading the ...
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1answer
118 views

Can pressurized aircraft be flown without pressurizing

Are there any pressurized aircraft models which can also be flown without pressurizing the cabin? For example, if there were a short ferry flight, or a flight where the aircraft never got high enough ...
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1answer
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Why is cabin pressure increased above ambient pressure on the ground?

As far as I know at least some (e.g. some Bombardier Dash-8 series) airplanes during takeoff may increase cabin pressure above air pressure on the ground, before starting to decrease it. In one case ...
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Why is an airliner cabin pressurized to a pressure altitude below field elevation before takeoff and landing? [duplicate]

Why is an airliner cabin pressurized to a pressure altitude lower than field elevation before takeoff and before landing, as depicted in the graph accompanying this answer? How does the cabin ...
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2answers
98 views

How does cabin pressure vary with respect to ambient pressure during descent?

I came across this statement in a book - "During a descent, the cabin pressure in a pressurized aircraft usually climbs at as lesser rate than ambient pressure". Could someone explain this statement ...
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1answer
421 views

What's the cabin pressure of a Bombardier CRJ-900? [closed]

In terms of altitude (6000, 7000, 8000, etc), what is the cabin pressure in a CRJ-900?
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1answer
93 views

Why was the 307’s pressurisation system removed when it was modified into the C-75, despite the fuel-burn advantage of higher-altitude flight?

The Boeing 307, an airliner derivative of the B-17 heavy bomber, was the first pressurised airliner to enter series production and go into service (hence its bulbous, altogether un-B-17-like fuselage, ...
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Are there any pressurized piston-engine aircraft?

Are there any pressurized piston engine-powered aircraft? Or does pressurization require a turboprop or jet?
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591 views

Why would short-haul flights be pressurised at a higher cabin pressure?

In the article here : https://abcnews.go.com/Health/Healthday/story?id=4507808&page=1 it is claimed that Short-haul flights are usually pressurized at 5,000 to 6,000 feet while long-haul ...
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4answers
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Can an airliner provide ground level cabin pressure, temperature, humidity etc?

Apart from the cost angle, which seems to be the biggest factor in airlines, is it technically possible to bring cabin atmosphere (includes pressure, temperature, humidity) etc. at par with ground ...
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2answers
224 views

How Cabin Pressures Are Selected?

The pilot puts the cruise altitude to the FMC and the plane auto adjusts the cabin pressure. I know that but I once heard the cabin pressure is set to three thousand feet. Is it true? Why is the ...
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1answer
151 views

Why is the alternate static pressure lower than the standard static vent pressure regardless of the venturi effect on both?

I understand that the higher relative airspeed around the body of an aircraft in comparison to the air within the cabin causes the cabin to experience a lower pressure. However, I was just thinking ...
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Cabin pressured for flights to/from high altitude airports [duplicate]

I was flighting from La Paz (El Alto airport, LPB) which it is located at an altitude of 4061 m (13 600 ft), which is above standard pressure of passenger flights. How is the cabin pressure usually ...
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2answers
741 views

Do pilots breathe the same air as passengers?

Do pilots breathe the same quality of air as passengers ? (i.e. identical parameters: same O2, CO2 and O3 levels, same temperature, same humidity, etc.) Do pilots breath the same air as passengers (...
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Why aren't aircraft cabins pressurized to sea level pressure?

From an article on WHO's website: Although aircraft cabins are pressurized, cabin air pressure at cruising altitude is lower than air pressure at sea level. At typical cruising altitudes in the ...
2
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1answer
220 views

Is it possible for crew oxygen to exacerbate a flight deck fire?

Crew oxygen is, as I understand it, a very high percentage of purity. Oxygen-enriched air acts as an accelerant to a fire, causing things to ignite which wouldn't in ordinary air, and making fire ...
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2answers
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Why don’t double-bubble fuselages cause severe fatigue problems?

In response to my previous two questions about fatigue issues, or the lack thereof, generated by the cusps in double-bubble-fuselaged aircraft (Stratocruiser, DC-9-80), I received a number of answers ...
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1answer
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Why and how can a fume event occur?

« A fume event occurs when bleed air used for cabin pressurization and air conditioning in a pressurized aircraft is contaminated by fluids such as engine oil, hydraulic fluid, anti-icing fluid, ...
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5answers
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Why is air mixed with bypass air on the A/C of an aircraft?

Air is taken from the compressors, then it is cooled by the air that comes from the ram air inlet. After that, it is compressed and cooled again by an expansion turbine. When finally air is condensed, ...
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3answers
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Does the B787 (Dreamliner) operate with higher cabin pressure?

The Boeing 787 Dreamliner's fuselage is almost completely made of composite carbon fibre material, which is not susceptible to metal fatigue. The main reason why the cabin pressure in a pressurized ...
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3answers
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Is the A330F main deck cargo compartment pressurized? If not, what is the purpose of the structural cargo access door?

I know there is a related question already asking if cargo holds in general are pressurized. My question is specifically about the A330-243F in the below photograph. That looks like a pressure ...
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1answer
993 views

How much air does a 777-300ER's pressure cabin hold?

I've been wondering how much air a 777-300ER's pressurised cabin holds, but, while most of its specifications are fairly easy to find, the amount of air it contains is not. Does anyone know what ...
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3answers
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What's the relation between cabin pressure and altitude?

Usually, cabin pressure of an airliner is kept at a value corresponding to an altitude of not more than about 2000m. Now, I heard that before takeoff, the pressure is already increased a little for ...
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3answers
8k views

Why is an unpressurized takeoff performed?

Why would an aircraft perform an unpressurized takeoff? What conditions lead to this being beneficial?
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5answers
21k views

Could a pilot incapacitate other crew/passengers by manipulating cabin air quality/pressure?

Could a pilot of an airliner incapacitate everyone outside the cockpit by somehow triggering a loss of cabin pressure while simultaneously disarming the airplane's oxygen masks, manipulating the air ...
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0answers
595 views

How do the air conditioning packs work for the CRJ 700/900? [duplicate]

Please provide details on how the packs on the CRJ 700/900 work. How does the system use air from the packs to make cold air for the aircraft?
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1answer
400 views

Is the air in aircraft cabin toxic?

I just listened to the recent BBC podcast episode Aerotoxicity: the hidden dangers of flying and there were interesting claims there: Cabin air in modern passenger aircrafts comes directly from ...
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2answers
119 views

Which are the advantages of low pressure levels during flight? (i.e during cruise flight in a commercial aircraft)

I understand that due to health and security reasons, there must be a minimum in the pressure inside the cabin (75 kPa). But in class I have been told that maintaining low pressure levels has ...
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1answer
578 views

Can the pilot stop airflow between cockpit and cabin?

During normal operation the entire fuselage is pressurized equally: An aircraft fuselage does not contain separate compartments with different pressure values in each. The entire vessel is ...
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2answers
1k views

Do pilots get more fresh air than passengers? [duplicate]

There is a famous air travel myth claiming that "pilots get more fresh air than passengers".       (source: The pure cure, p.375) I would like experts to either dispel or confirm this myth, that ...
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2answers
2k views

Why does the cabin air sometimes smell of kerosene? [duplicate]

Why does the cabin air sometimes smell of jet fuel, although bleed air is tapped before it comes in contact with fuel ? How is this possible? I have smelled this a couple of times in my life (twice ...
0
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1answer
243 views

Why can't I ever get my right ear to pop on descent in a plane?

Whenever I'm flying, there's a period of descent where my right ear just refuses to pop. This has been bothering me for at least ten years. There seems to be a long stage of descent where my ear is ...
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2answers
379 views

To what extent does pressurisation increase the rigidity of an airframe?

A vessel such as a balloon or the rubber air-cell of an inflatable boat will become more rigid when pressurised. The same must happen to the fuselage of a pressurised aircraft - but to what extent? ...
6
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1answer
596 views

Are pressurized passenger aircraft usually completely airtight?

Various sources on the internet indicate that the passenger cabins on pressurised airplanes are not 100% airtight. I'm not talking about ventilation/pressure valves/cabin pressurisation system, but ...
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7answers
18k views

Is it true that a soda can or a bag of chips will pop in a plane at high altitude? [closed]

I've heard some conspiracy theorists claim that if you were to bring a soda can or a bad of chips onto an airplane, they would pop? Is this true? If so, why?
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2answers
475 views

Is if safe/legal for an aircraft to return to cruising altitude after passenger oxygen masks have been deployed?

I was reading reports [1,2,3,4] about a recent Air China flight where one of the pilots was allegedly smoking and, in an effort to prevent the smoke circulating to the cabin, accidentally de-...
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2answers
1k views

Has the typical cabin pressure in airliners changed in recent decades?

Two or three decades ago, I would experience quite uncomfortable blocking of the eustachian tubes, which would noisily unblock and become blocked once more as the plane descended. I haven't ...
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3answers
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Are cargo holds pressurised these days?

This question is only regarding aircraft that seat more than about 100 people. Are cargo holds pressurised these days, what is the situation? Are only some pressurized, most, of every single one? ...
9
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2answers
2k views

Does the Airbus A350 have an Automatic Emergency Descent System?

In 2009 Airbus went public with a new feature in the Airbus A350, an Automatic Emergency Descent (AED) System. The system would detect a rapid depressurization and, after a defined waiting time, ...
4
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3answers
476 views

Is the increased humidity on modern jets artificial?

Is the increased humidity on jets such as the 787 and A350 artificial? Or is it a direct result of a greater cabin pressure?